Question

(7a + 2b) elevado ao cubo​

Answer 1

$(7a + 2b) {}^{3} \\ \\ (7a) {}^{3} + 3 \: . \: (7a) {}^{2} \: . \: 2b + 3 \: . \: 7a \: . \: (2b) {}^{2} + (2b) {}^{3} \\ \\ 343a {}^{3} + 3 \: . \: 49a {}^{2} \: . \: 2b + 3 \: . \: 7a \: . \: 4b {}^{2} + 8b {}^{3} \\ \\ \boxed{\boxed{\boxed{343a {}^{ 3} + 294a {}^{2}b + 84ab {}^{2} + 8b {}^{3} }}}$